Bruno wesselmann



To all whom it may concern:

QlNiTED STATES PATENT.' Ormea BRUNO `VESSELMANN, OF HAMBURG, GER-MANY.

DOOR-LOCK.

SPECIFICATION vforming part of Letters Patent No'. 293,548, datedFebruary 12, 1884.

Application filed CctalzcrV 2; 1853. (No model.) Patented in GermanyDecember !l.1SE2,No.23,011.

Be it known that I, `BRUNO WEssELMANN, a subject of the Emperor ofGermany, and a resident of Hamburg, in the German Empire,- have inventedcertain new and useful Im provements in Door-Locks, (for which LettersPatent have heretofore been granted to me by the Government ofGermany,under date of December 9, 1882, numbered 23,911,) of which lthefollowing is a specication.

The invention relates to certain improvements in door-locks, by whichthe construction of the saine is considerably simplified; and theinvention consists, iirst, of the combination, with the spring4bolt,main bolt, and latch, of a spiral spring that is interposed between anextension of the springbolt and the tumbler of the main bolt, saidtumbler having a downwardlyextending arm that engages the latch,

so that thereby the bolts and latch are acted upon by one spring only;and, secondly, of a nut placed on the knobspindle, and being made of twoparts7 of an interior portion and an exterior sleeve-shaped portion,which latter is guided by a slot on a guide-stop of the interiorportion, between-which anda shoulder of the knob-spindle a spiral springis interposed, that retains by its pressure the inner j nut in positionwhen the door is thrown into closed position.

Inthe accompanying drawings, Fi gurel represents a side elevation of myimproved doorlock, shown partly in section, and with the cover removed;and Figs. 2 and 3 are respectively a vertical transverse and horizontalsection on lines m a: and y y, Fig. l.

`Similar letters of reference indicate corresponding parts. A in thedrawings represents the casing of my improved door-lock, in which isarranged, one below the other, a spring-bolt, e, a main bolt, 7L, and alatch-bolt, f. The spring-bolt e projects with it-s beveled end throughan aperture of the face-plate of the casing, and is guided in the usualmanner bya slot, e, on a iiXed transverse pin, e2, of the casing. Theinner end of the spring-bolt e is hinged to projecting ears aL of a nut,a a, through the square center hole of which the knob spindle b ispassed. A hook-shaped prolongation, a?, extends backwardly from theprojecting ears of the nut a, and is acted upon by a slide-bolt,

c, that is guided in a socket, c2, and cushioned by a strong spiralspring, e, which is interposed between the slide-bolt c and the bottomof the socket.

the concave under side of the hook ai.` The The outer end of theslide-bolt c is rounded off, so as to move readily along j.

lower end of the socket c2 is made of conicallytween the spring-nut a aand the tumbler g the spring c acts on all the three bolts e, Vh, and fofthe lock, according as either one of them is thrown into use. `It actson the springbolt e by the pressure of the slide-bolt c', and on themain'bolt h'and latch f by the pressure of the socket c2 on the tumblerg. TheV construction of the lock is thereby considerably simplied, asthe different springs,which have heretofore been required in connectionwith the different bolts, are replaced by the single spring c.

For the purpose of preventing the turning of the knob-spindle and knobswhen thelock is closed by pushing the door into closed position withouttaking hold of the knob, the nut an on the spindle is made of twoparts-an interior nut, a, and an exterior sleeve c. The exterior sleeve,a', is provided with a slot, a5, through which projects a guide-stop,as, that is xed to the inner nut, a, so as to communicate the motion ofthe knob-spindle to the sleeve a', and thereby to the extension-hook a2of the spring -bolt e. A spiral spring, d, is inter posed between theinner nut, a, and a shoul-V der, b', of the knob-spindle Z, as shown inFig. 2, which spring presses tightly upon the inner nut, a, so as tokeep the latter in position when the spring-bolt is pushed back into thecasing A on throwing the door into closed position without taking holdof the knob. The spiral spring d exerts a frictional pressure upon theinterior nut, a, which pressure is sufliciently IOO swung to prevent thenut a from following the motion of sleeve a, caused by the pushing in ofthe spring-bolt e. The sleeve e movesi thereby freely around the nut ceuntil the guidestop ai of the nut a arrives at the end of the slot ai ofthe sleeve a', and stops thereby the sleeve. Then the spring-bolt ismoved forward again by the mainspring c, the sleeve a movesA in oppositedirection on the nut a until the opposite end of slot a5 arrives at theguide-stop a". When, however, the door is opened or closed by taking4hold of and turning the knob, the inner nut, a, takes, by its guide-stopa, the sleeve a along, and draws thereby the springbolt c back in theusual manner.

I-Iaving thus described my invention, I claim as new and desire tosecure by Letters Patentl. The combination of the knob-spindle Z), nut aa', having ears a* and extension-hook f, spring-bolt e, hinged to theears a, spring' actuated slide-bolt c', guidesocket c?, tumbler g,having -a seat for the guide-socket and a downwardly-extending arm, gg2, main bolt 7l, and latch f, substantially as set forth.

ing a guide-slot, a, extension-hook a2, and ears A a, spring-holte,hinged to the ears a, and a spiral spring, d, interposed between ashoulder, b', of the spindle and the interior nut, e, substantially asset forth.

In testimony that I claim the foregoing as my invention I have signed myname, in presence of two Witnesses, this 11th day of September, 1883.

BRUNO wnssnLMNN.

XVitnesses:

ALEXANDER Srnoirr, EMIL HAAsn.

